Overview
Spitz malignant melanoma is a rare and aggressive variant of Spitz neoplasms, characterized by specific clinical, morphologic, and molecular features. While most Spitz neoplasms are indolent, a subset, particularly those with MAP3K8 rearrangements, can exhibit aggressive behavior and metastatic potential 1.Diagnosis
Most MAP3K8 Spitz neoplasms have excellent prognoses, with aggressive behavior being rare 1.
Aggressive behavior and metastatic cases are associated with genomic mutations indicative of tumor progression 1.
Morphologic features that may lead to a diagnosis of Spitz melanoma include nodular silhouette, large cell size, epithelioid morphology, and severe nuclear atypia 1.Management
Management strategies for Spitz malignant melanoma are not detailed in the provided abstracts.Special Populations
No information is available on special populations in the provided abstracts.Key Recommendations
Most MAP3K8 Spitz neoplasms have excellent prognoses, apart from rare cases harboring additional genomic abnormalities associated with tumor progression 1. (Evidence: Moderate)
Metastatic cases of Spitz neoplasms have genomic mutations associated with tumor progression 1. (Evidence: Moderate)
Morphologic features such as nodular silhouette, large cell size, epithelioid morphology, and severe nuclear atypia are frequently observed in MAP3K8 Spitz neoplasms, leading to more frequent diagnoses as Spitz melanoma 1. (Evidence: Moderate)References
1 Patel P, Hagstrom M, Sharma N, Chen A, Dhillon S, Fumero-Velázquez M et al.. Clinical, Morphologic, and Molecular Features of MAP3K8 Rearranged Spitz Neoplasms: A Retrospective Study Documenting That Bonafide Spitz Melanomas Are Rare. The American journal of surgical pathology 2024. link